JP6644841B2 - Variable valve lift device for engine - Google Patents

Description

The present invention relates to a variable valve lift device for an engine, and more particularly, to a variable valve lift device for an engine that controls a valve lift according to operating conditions of a vehicle.

BACKGROUND ART A valve mechanism applied to an automobile engine supplies an air-fuel mixture to a combustion chamber and discharges combustion gas according to the stroke of the engine.
In recent years, the valve opening rate and the opening / closing timing of the valve are changed according to the operating conditions of the engine, that is, the operating range of the engine divided by the engine speed and the load, so that the inflow of the air-fuel mixture and the emission efficiency of the combustion gas are reduced. An optimized variable valve mechanism has been developed and applied to engines.
Thereby, the variable valve mechanism for an automobile engine improves the performance of the engine such as the fuel consumption, torque, and output of the engine, and reduces the amount of exhaust gas.
Such a variable valve mechanism for an automobile engine includes a variable valve timing mechanism for varying the opening / closing timing of a valve, a variable valve lift mechanism for varying a valve opening amount, a variable valve operating angle mechanism for varying an operating angle of a valve, and the like. Consists of
Among them, the variable valve lift mechanism is for improving output and fuel efficiency in a medium to low speed mode, and includes a rocker arm system, a pivot system, a tappet system, and a bucket system. It is divided into, for example.

On the other hand, in the variable valve lift mechanism according to the related art, the displacement of the intake valve is always constant irrespective of the load on the vehicle, so that the engine speed for achieving the optimum efficiency is limited. There is a problem that the combustion is unstable due to the backflow of the exhaust gas, and the fuel efficiency of the vehicle is reduced.
As a result, the hydraulic pressure is used to stop the valve. However, this has a problem that the structure of the variable valve lift mechanism is complicated and the workability is reduced.
Also, when hydraulic pressure is used, the viscosity of the hydraulic oil reacts sensitively to temperature, and the hydraulic oil pressure is changed, resulting in a malfunction of the variable valve lift mechanism. There was a problem that it decreased.
In order to solve such a problem, the present applicant disclosed in Patent Documents 1 to 3 below, for example, that some cylinders are deactivated at low speed and low load of the engine, and at high speed and high load. A variable valve lift technology for an engine that improves the efficiency of the engine by performing a pause control operation for activating the entire cylinder and a two-stage variable control operation of a high-speed mode and a low-speed mode has been disclosed and registered.

Patent Documents 1 to 3 apply a locking pin for connecting or separating the first body and the second body, install a drive module behind the locking pin, and make the locking module move out and in.
This requires another space for installing the drive module installed on the rear side of the first and second bodies in the cylinder head, and completely eliminates the limitation of the cylinder head structure. There was a limit.

Republic of Korea Patent Registration No. 10-1736806 (2017.5.22. Notice) Republic of Korea Patent Registration No. 10-1675511 (2016.11.22. Notice) Republic of Korea Patent Registration No. 10-1731621 (2017.3.17. Notice)

The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a variable valve lift device of an engine that controls a valve lift amount according to a vehicle operating condition. is there.
Another object is to provide a variable valve lift device for an engine that can deactivate some cylinders when the vehicle is running at low speed and low load.
Still another object is to provide a variable valve lift device for an engine that eliminates the restriction of the cylinder head structure when mounted on a vehicle and improves the operation performance of the valve.

To achieve the above object, a variable valve lift device for an engine according to the present invention includes a first body that rotates within a predetermined angle range by rotating a high-speed cam coupled to a camshaft; When connected to or separated from the body and connected to the first body, it rotates by the rotation of the high-speed cam, and when separated from the first body, provided on both sides of the high-speed cam. A second body that rotates by the rotation of the low-speed cam to adjust the lift amount of the valve, and connects or separates the first body and the second body through the second body; A locking pin coupled to the first body so as to be able to move in and out of the first body, a driving module connected to the locking pin through a connecting member to move the locking pin in and out, and disposed on the valve. The said A rotating shaft installed across both side walls of the first body and the second body so that the first body rotates, and a first shaft installed on the rotating shaft and rotated by the high-speed cam. of anda restoring spring providing a restoring force to return to the original position of the body, based on the operating conditions of the engine, to variably control the lift amount of the valve in two stages of fast and slow modes, the engine low speed, Operating the locking pin in a low load state to separate the first body and the second body and perform a stop control operation of a valve for deactivating a cylinder; The connection member for transmitting the driving force of the driving pin to the locking pin is installed between the driving pin and the locking pin of the driving module, and the driving module is formed in a cylindrical shape. Case Installed at the lower end of the housing, a square plate-like flange portion is formed so as to be installed on the upper surface of a cylinder head of a vehicle, and the connecting member is made of a material having flexibility and shape freezing property. It is installed in a protective tube made of a material .

ADVANTAGE OF THE INVENTION According to the variable valve lift apparatus of the engine by this invention, the stop control operation of the valve which deactivates some cylinders, and the two-stage variable control operation of the high speed mode and the low speed mode can be performed according to the operating conditions of the engine. .
That is, according to the present invention, the first body and the second body are selectively connected or separated by using the locking pin to implement the opening / closing operation and the stop control operation of the valve, thereby reducing the engine speed. In addition, some cylinders can be deactivated in a low load state.
As a result, it is possible to minimize the amount of fuel consumption at low engine speed and low load, improve the efficiency of the engine, and maximize the fuel efficiency of the vehicle.
Further, by applying a connecting member between the driving pin and the locking pin of the driving module to cause the locking pin to protrude and retract to connect or release the first and second bodies, the same characteristics and operation of the valve are achieved. Performance can be improved.
In addition, by installing the drive module above the cylinder head, the mounting space when mounting on the cylinder head is minimized, so that the restriction on the cylinder head structure can be minimized.

Further, according to the present invention, the restoring springs for returning the first body to the original position are respectively installed inside the first body, so that the compression spring is conventionally installed in contact with the lower part of the first body. In this case, it is possible to omit a head machining operation for the first body, which is necessary when the first body is used.
As a result, the work of machining the head of the first body by applying the conventional compression spring is eliminated to improve the workability, and the configuration of the variable valve lift device of the engine is simplified, so that the engine of the actual vehicle can be easily mounted. Can be applied.
In addition, by moving the pivot point, which is the center of rotation of the first body, to the valve side to reduce weight and inertia moment, the same characteristics and operability of the valve can be improved.
Also, a semi-cylindrical pressing piece may be formed on both sides of the second body, or openings may be formed on both sides of the second body, and contact surfaces may be formed on both ends of the first rotating shaft. The operating characteristics of the valve can be improved by increasing the contact area by contacting the upper end of the valve with the contact surface.
Further, the length of the rotating shaft connected to the first and second bodies can be minimized, thereby reducing the weight of the product and improving the operating characteristics of the valve.
Further, according to the present invention, the two-stage control operation and the stop control operation of the valve can be realized by using the same variable valve lift device and by the configuration of the cam.
Further, according to the present invention, the cost can be reduced by integrally manufacturing the roller rocker arm and the second body by using a swing arm type structure instead of the conventional direct acting type. By changing the shape of the front wall of the body, rigidity can be reinforced and locking performance can be facilitated.
As a result, according to the present invention, in the cylinder stop mechanism and the two-stage variable valve lift mechanism using hydraulic pressure, the effects of reducing workability due to oil processing and limiting oil temperature (viscosity) can be solved. Can be

FIG. 1 is a perspective view of a variable valve lift device for an engine according to a first embodiment of the present invention. FIG. 2 is a partially exploded perspective view of the variable valve lift device of the engine in FIG. FIG. 3 is a partially enlarged cross-sectional view of a head in which the variable valve lift device of the engine in FIG. 1 is installed. FIG. 4 is an operation state diagram showing an operation state of the variable valve lift device for an engine according to the first embodiment of the present invention. FIG. 5 is an operation state diagram showing an operation state of the variable valve lift device for an engine according to the first embodiment of the present invention. FIG. 6 is a perspective view of a variable valve lift device for an engine according to a second embodiment of the present invention. FIG. 7 is an operation state diagram showing an operation state of the variable valve lift device for an engine according to the second embodiment of the present invention. FIG. 8 is an operation state diagram showing an operation state of the variable valve lift device for an engine according to the second embodiment of the present invention.

Hereinafter, a variable valve lift device for an engine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
The variable valve lift device for an engine according to the present invention controls a suspension control operation for activating or deactivating a cylinder (Cylinder Deactivation) according to the operating conditions of a vehicle, and controls a valve lift amount to two stages of high speed and low speed. It is configured to perform a variable stage control operation.
In this specification, a configuration that implements a valve stop control operation will be described as a first embodiment, and a configuration that variably controls a valve in two stages based on the configuration of the first embodiment will be described as a second embodiment.
For this purpose, one cam is installed on the camshaft of the engine when implementing the valve stop control operation, and when implementing the two-stage variable control operation of the valve, the high-speed cam and both sides of the high-speed cam are provided. Each has a low-speed cam.

Example 1
FIG. 1 is a perspective view of a variable valve lift device of an engine according to a first embodiment of the present invention, and FIG. 2 is a partially exploded perspective view of the variable valve lift device of the engine in FIG. FIG. 3 is a partially enlarged cross-sectional view of the head in which the variable valve lift device of the engine in FIG. 1 is installed.
In the following, terms indicating directions such as 'left', 'right', 'front', 'rear', 'up', and 'down' will refer to the respective states based on the state shown in each drawing. It is defined as indicating a direction.
As shown in FIGS. 1 and 2, the variable valve lift device for an engine according to the first embodiment of the present invention rotates within a predetermined angle range by rotating a cam 11 coupled to a camshaft 10. The first body 20 to be connected, the second body 30 for maintaining the valve 14 in an open / closed or closed state based on whether or not the first body 20 can be connected, and the first body 20 and the second body 30 are connected. Alternatively, the locking pin 40 is coupled to the front of the first body 20 so that the locking pin 40 can be extended and retracted toward the front of the first body 20, and is connected to the locking pin 40 via a wire 60 so that the locking pin 40 can be extended and retracted. And a drive module 50 for performing the operation.

As shown in FIG. 3, the variable valve lift devices of the engine are provided in a number corresponding to each cylinder of the engine, and are installed above the cylinder head 70 so as to be inclined by a predetermined set angle.
At the same time, the variable valve lift device for the engine according to the first embodiment of the present invention is installed on the rotating shaft 21 on which the first body 20 rotates, and the first body 20 rotated by the cam 11 And a restoring spring 15 for providing a restoring force to return to the position.
The restoring spring 15 is provided as a torsion spring whose central portion protrudes forward.
For example, the central portion of the restoring spring 15 is inserted into an insertion hole 311 formed in the front wall 31 of the second body 30 described later, is supported so as not to be able to move up and down, and projects forward. Both ends of the restoring spring 15 are supported by support steps 26 formed on both side walls of the first body 20 described later.

As described above, according to the present invention, the compression spring is conventionally brought into contact with the lower portion of the first body by installing the restoring spring for returning the first body to the original position on the rotation axis of the first body. The head machining operation of the first body, which is required when the first body is installed, can be omitted.
As a result, the present invention eliminates the conventional head machining operation of the first body by applying a compression spring, improves workability, and simplifies the configuration of the variable valve lift device of the engine. It can be easily applied to any engine.

The first body 20 includes both side walls and a rear wall so that the front is open when viewed from above, and the cross section is substantially “U” shaped.
A rotating roller 22 that is rotated by the rotation of the cam 11 is installed inside the first body 20 so as to minimize friction when the first body 20 comes into contact with the cam 11.
At the front ends of both side walls of the first body 20, coupling holes 23 to which the rotating shafts 21 are respectively formed are formed. At the center portions of both side walls of the first body 20, the roller shafts 24 of the rotating rollers 22 are respectively provided. A mounting hole 25 to be installed is formed.
The rotating shaft 21 is penetratingly coupled across both side walls of the first body 20 and both side walls of the second body 30, and a restoring spring 15 is installed on an outer peripheral surface at a central portion of the rotating shaft 21.
Thereby, the first body 20 is rotatable around the rotation shaft 21.

The roller shaft 24 is penetratingly coupled across a pair of mounting holes 25 formed on both side walls of the first body 20, and between the roller shaft 24 and the rotating roller 22, the rotating roller 22 rotates smoothly. Is provided with a bearing.
Such a roller shaft 24 is formed so as to extend to a length corresponding to a distance between a pair of outer walls 33 of the second body 30 described later, or is divided into a plurality as shown in FIG. It is formed.
On the other hand, support steps 26 for supporting both ends of the restoring spring 15 are formed on the inner surfaces of both side walls of the first body 20, respectively.
The locking pin 40 is provided on the rear wall of the first body 20 so that the rotation of the cam 11 causes the first and second bodies 20 and 30 to rotate together when the locking pin 40 moves forward. Is formed, and a locking step 27 is formed.

The second body 30 is disposed on the front surface and both side surfaces of the first body 20, and when viewed from above, the rear surface is open, and the front wall 31 and both sides thereof are substantially U-shaped. Provide a wall.
The two side walls of the second body 30 each include an inner side wall 32 and an outer side wall 33.
On both sides of the front wall 31 of the second body 30, pressing pieces 34 are formed between the inner wall 32 and the outer wall 33 to contact the upper end of the valve 14 and press the valve 14 to move up and down. You.
The pressing piece 34 is formed in a semi-cylindrical shape having a downwardly convex cross section so as to smoothly press the upper end of the valve 14 during the rotation of the second body 30 due to the rotation of the cam 11. Is done.
Accordingly, the pressing piece 34 presses the upper end of the valve 14 downward by the rotation of the second body 30 to perform an up-and-down operation, so that the valve 14 can be opened and closed.

Therefore, the present invention can improve the operating characteristics of the valve by forming a semi-cylindrical pressing piece on both sides of the second body and increasing the contact area by bringing the pressing piece into contact with the upper end of the valve. .
The rear end of the second body 30 is supported by the pivot support mechanism 16.
In this embodiment, the pivot support mechanism 16 is provided as a hydraulic lash adjuster that automatically adjusts the gap between the valves 14 using hydraulic pressure.
For example, the hydraulic lash adjuster is capable of finely adjusting the interval between the valves 14 by performing expansion and contraction operations by a change in oil pressure in a state where oil is constantly supplied to the inside.
That is, when the pressure of the oil is lower than a predetermined set pressure, the hydraulic lash adjuster maintains the contracted state by maintaining the closed check valve provided therein.

On the other hand, when the pressure of the oil becomes equal to or higher than a predetermined set pressure, the hydraulic lash adjuster operates to open the internal check valve, expands by opening the oil movement path, and causes the second body 30 to extend. By moving the rear end upward, the distance between the valves 14 is adjusted.
For this purpose, a support plate 35 is formed outside each of the pair of inner side walls 32 of the second body 30 so as to be in contact with and supported by the upper end of the pivot support mechanism 16.
As a result, the second body 30 rotates about the pivot support mechanism 16.
On the other hand, at the rear end of the second body 30, there is provided a mounting portion 36 on which a locking pin 40 is slidably mounted toward the front, and a central portion of the mounting portion 36 extends in the front-rear direction. Thus, a moving space 37 is formed.
Such a mounting portion 36 is provided between the rear ends of the pair of inner side walls 32 of the second body 30.

Then, on both sides of the second body 30, when the engine is at a low speed and at a low load, the first and the second rotating members come into contact with the low speed cam 13 described in the configuration of the second embodiment shown in FIG. Second rollers 38 and 39 are provided.
To this end, the outer walls 33 on both sides of the second body 30 are each formed to extend to a length corresponding to the length of the inner wall 32, and an opening is provided between each outer wall 33 and the inner wall. And a support plate 35 are formed.
Therefore, the first and second rollers 38 and 39 are rotatably mounted on the roller shaft 24 which is connected to the inner wall 32 and the outer wall 33 on both sides of the second body 30, respectively.
A bearing is provided at the center of each of the first and second rollers 38 and 39, and the first and second rollers 38 and 39 are provided on both sides of the first and second rollers 38 and 39, respectively. In the rotation operation, two pairs of roller bushes 381, 382, 391, 392 formed in a disk ring shape are installed so as to prevent the bearing from shifting.

The locking pin 40 is connected to the driving pin 51 of the driving module 50 via the wire 60, and moves backward or forward by the vertical movement of the driving pin 51.
On the outer peripheral surface of the locking pin 40, a locking spring 41 for providing a restoring force to the locking pin 40 is installed. Such a locking spring 41 is disposed in a moving space 37 formed in the mounting portion 36 of the second body 30.
Here, the locking pin 40 is formed in a column having a substantially circular or elliptical cross section, and is installed such that the front end of the wire 60 contacts the rear end of the locking pin 40.
An annular support portion 42 for supporting the rear end portion of the engagement spring 41 is formed on the outer peripheral surface of the central portion of the engagement pin 40, and the annular support portion 42 is configured to move inside the second body 30. The moving distance to the rear can be restricted by the retaining ring 43 installed in the space 37.
The drive module 50 is provided as a solenoid that operates to move the drive pin 51 up and down according to a control signal of an electronic control unit (not shown) that controls the operation of the engine.

For example, when power is supplied by the control signal in a state where the distal end of the drive pin 51 is connected to the rear end of the wire 60 and the distal end of the wire 60 is in contact with the locking pin 40, the drive module 50 is wound inside. A magnetic field is generated by the taken coil, and the drive pin 51 is moved upward. Then, the locking pin 40 moves rearward together with the wire 60 pressed into the driving pin 51. Thereby, the connection between the first body 20 and the second body 30 is released.
When the power is turned off by the control signal, the drive module 50 moves the drive pin 51 downward by removing the magnetic field generated inside. Then, the locking pin 40 can move forward while elastically deforming the locking spring 41 and return to the original position. As described above, the first body 20 and the second body 30 are connected by moving the locking pin 40 forward.

The driving module 50 thus configured is installed in a housing 52 formed in a cylindrical shape, and a lower end of the housing 52 is provided with a substantially square plate so as to be installed on an upper surface of a cylinder head 70 of the vehicle. A flange 53 is formed.
A plurality of fastening holes are formed in the flange portion 53 so that a plurality of fixing bolts (not shown) are fastened to the cylinder head 70 through the flange portion 53.
The wire 60 is made of a rigid metal material so as to transmit a driving force for moving the locking pin 40 backward or forward by the vertical movement of the driving pin 51. 3, a coupling groove 61 into which the driving pin 51 is press-fitted is formed at the upper end. The front end of the wire 60, that is, the lower end in FIG. It can be formed by being bent forward so as to be transmitted to the locking pin 40 and move the locking pin 40 backward or forward.

Such a wire 60 is installed in a protective tube 62 installed between the housing 52 of the drive module 50 and the rear end of the locking pin 40.
On the other hand, in the present embodiment, it has been described that the driving force for moving the locking pin 40 backward or forward is transmitted by the vertical movement of the driving pin 51 using the wire 60, but the present invention is not limited to this. Not something.
That is, the present invention can be modified so as to transmit the driving force to the locking pin by applying a connecting member having various shapes and structures such as a spring as well as the wire.
A space is formed inside the protection tube 62 so as to install the wire 60, and a guide 63 that guides the protection tube 62 is installed outside the protection tube 62. The guide 63 is provided with one or more brackets 64 for fixing the protection tube 62 in the cylinder head 70.
The guide 63 is formed in a substantially square plate shape, and a coupling space corresponding to the outer shape of the protection tube 62 is formed in the center of the guide 63. The upper end and the lower end of the guide 63 are respectively formed on the lower surface of the housing 52. And, it can be formed by being bent forward so as to be in close contact with the upper surface of the internal space of the cylinder head 70.

For example, the bracket 64 is provided at each of the central portion and the lower end portion of the guide 63, and fastening holes through which the fixing bolt (not shown) is fastened are formed on both sides of the bracket 64.
On the other hand, an installation space 54 for installing the drive pin 51, the wire 60, and the protection tube 62 is formed in the housing 52, and the second body 30 and the housing First and second coupling members 65, 66 for coupling to the body 52 are provided.
The first coupling member 65 is formed in a substantially cylindrical shape with an open rear surface so that the distal end of the protective tube 62 is coupled, and is coupled to the rear end of the second body 30.
The second coupling member 66 is formed in a substantially cylindrical shape with an open lower surface so that the rear end of the protective tube 62 is coupled, and is coupled to the installation space 54 of the housing 52.

Here, the outer peripheral surface of the upper end of the second coupling member 66 and the inner peripheral surface of the installation space 54 formed in the housing 52 are formed with threads for connecting the protective tube 62 to the housing 52. You.
Such a protection tube 62 is made of a material having a shape that is flexible and has a shape freezing property that maintains a predetermined shape so that the wire 60 and the protection tube 62 can be easily installed in the installation work.
As described above, according to the present invention, the driving module that causes the locking pin to move up and down is installed above the cylinder head, and the driving force of the driving module is applied to the locking pin by using the connecting member installed in the protection tube. Can be transmitted.
Thus, according to the present invention, the driving force is transmitted to the locking pin via the connecting member, and the locking pin is caused to protrude and retract to connect or disconnect the first body and the second body.

That is, the present invention provides a push rod type in which a connecting member is applied between a driving pin and a locking pin to make the locking pin move out and out, and the driving pin and the locking pin are configured to have rigidity of the locking pin and the driving pin. Can be improved.
In particular, according to the present invention, by installing the drive module above the cylinder head, it is possible to minimize the mounting space when mounting to the cylinder head, and to minimize the restrictions on the cylinder head structure.
On the other hand, in the present embodiment, it has been described that the drive module that causes the locking pin to move in and out is provided as a solenoid. However, the present invention is not limited to this. Not only the solenoid but also a power supply such as a motor is provided. It is modified to apply various forms of actuation units driven by.

Next, a method of operating the variable valve lift device for the engine according to the first embodiment of the present invention will be described in detail with reference to FIGS.
FIGS. 4 and 5 are operation state diagrams showing the operation state of the variable valve lift device for the engine according to the first embodiment of the present invention.
FIG. 4 shows an operation state in which the valve is opened and closed by rotating the cam in the variable valve lift device of the engine, and FIG. 5 shows an operation state in which the valve is controlled to be stopped.
In the variable valve lift apparatus for an engine according to the first embodiment of the present invention, when the valve 14 is opened and closed by rotating the cam 11, as shown in FIG. 4, the power supplied to the drive module 50 is shut off. . Then, as the drive pin 51 moves downward, the wire 60 moves forward, and the locking pin 40 is pressed by the wire 60 and moves forward.
Here, the distal end of the locking pin 40 penetrates through the mounting portion 36 of the second body 30 and locks to the locking step 27 formed on the rear wall of the first body 20 while protruding forward. Thus, the first body 20 and the second body 30 are connected.

Accordingly, the variable valve lift device for the engine according to the first embodiment of the present invention allows the valve 14 to rotate while the first and second bodies 20 and 30 rotate within a predetermined angle range by the rotation of the cam 11. It can be opened and closed by raising and lowering.
Here, the central portion of the restoring spring 15 installed on the rotating shaft 21 is supported so as not to move up and down while being inserted into the insertion hole 311 formed in the front wall 31 of the second body 30 and restored. Both ends of the spring 15 are supported by supporting steps 26 formed on both side walls of the first body 20.
As a result, the restoring spring 15 applies a restoring force to the first body 20, and can return the first and second bodies 20, 30 rotated by the cam 11 to their original positions.

On the other hand, in the variable valve lift device of the engine according to the first embodiment of the present invention, when the stop control operation of the valve 14 is implemented to deactivate some cylinders, the control signal of the electronic control unit is used. Power is supplied to the drive module 50.
Therefore, as shown in FIG. 5, as the drive pin 51 of the drive module 50 moves upward, the wire 60 moves backward, the locking pin 40 moves backward, and returns to the original position. .
Here, the locking pin 40 is locked to the retaining ring 43 provided in the moving space 37 by the annular support portion 42, and the rearward moving distance is limited. To prevent

In this way, the first body 20 and the second body 30 are separated by fitting the locking pin 40 in the mounting portion 36 of the second body 30 while moving backward.
Then, the front end and the rear end of the second body 30 are fixed in contact with the upper end of the valve 14 and the upper end of the pivot support mechanism 16, respectively.
Therefore, the variable valve lift device of the engine according to the first embodiment of the present invention has the second body 30 in contact with the upper end of the valve 14 fixed even when the cam 11 rotates, so that the valve 14 Can be realized.
As described above, the present invention selectively connects or separates the first body and the second body using the locking pin, and realizes the opening / closing operation and the stop control operation of the valve. Some cylinders can be deactivated at low speed and low load.
As a result, the present invention can minimize the amount of fuel consumption at low engine speed and low load, improve the efficiency of the engine, and maximize the fuel efficiency of the vehicle.

According to the above-described process, the present invention can perform the stop control operation of the valve for deactivating some cylinders according to the operating conditions of the engine.
Then, the present invention moves the pivot point of the first and second bodies to the side surface of the valve to reduce the moment of inertia, bring the rotating shaft and the valve into direct contact, and operate the valve up and down by moving the valve up and down. The same characteristics and operability can be improved.
On the other hand, in the first embodiment, it has been described that the stop control operation of the valve is performed, but the present invention is not limited to this.
That is, according to the present invention, by changing only the configuration of the cam and using the variable valve lift device of the engine having the same configuration, the two-stage control operation of the valve and the stop control operation can be realized by the configuration of the cam.

Example 2
Next, a configuration of a variable valve lift device for an engine according to a second embodiment of the present invention will be described in detail with reference to FIG.
FIG. 6 is a perspective view of a variable valve lift device for an engine according to a second embodiment of the present invention.
The variable valve lift device for an engine according to the second embodiment of the present invention is similar to the configuration of the first embodiment, as shown in FIG. 6, except that the valve lift amount depends on the operating conditions of the engine. In order to perform two-stage variable control on the high-speed mode or the low-speed mode, some components are added.
That is, the camshaft 10 has a high-speed cam 12 for controlling the lift amount of the valve 14 to a maximum value when the engine is running at a high speed and a high load, and has a minimum lift amount for the valve 14 when the engine is running at a low speed and a low load. And a low-speed cam 13 for control.

The high-speed cam 12 has a shape corresponding to the cam 11 of the first embodiment.
The low-speed cams 13 are provided as a pair so as to come into contact with both sides of the second body 30, respectively, and are installed on both sides of the high-speed cam 12, respectively.
Such a low-speed cam 13 is manufactured to have a smaller maximum diameter than the maximum diameter of the high-speed cam 12.
Here, the rotating roller 22 coupled to the roller shaft 24 is installed in contact with the high-speed cam 12, and the first and second rollers 38, 39 are installed in contact with the pair of low-speed cams 13, respectively.

Next, an operation method of the variable valve lift device for the engine according to the second embodiment of the present invention will be described in detail with reference to FIGS.
7 and 8 are operation state diagrams showing an operation state of the variable valve lift device for an engine according to the second embodiment of the present invention.
FIG. 7 shows an operation state of the variable valve lift device of the engine which operates in the high-speed mode when the engine is in a high-speed and high-load state. FIG. 8 shows an operation in the low-speed mode when the engine is in a low-speed and low-load state. 3 illustrates an operation state of a variable valve lift device of an engine.
The variable valve lift device for an engine according to the second embodiment of the present invention, as shown in FIG. 7, when the power supplied to the drive module 50 is cut off when the engine is at a high speed and a high load, Moves downward, and the locking pin 40 connected to the driving pin 51 via the wire 60 is moved forward by the restoring force of the locking spring 41.

As a result, the first locking pin 40 penetrates the mounting portion 36 of the second body 30 so that the distal end projects forward, while being engaged with the locking step 27 formed on the rear wall of the first body 20. By locking, the first body 20 and the second body 30 are connected.
At this time, the first body 20 comes into contact with the high-speed cam 12 installed on the camshaft 10 and rotates together with the second body 30.
As a result, the variable valve lift device for the engine according to the second embodiment of the present invention provides the valve 14 while the first and second bodies 20, 30 rotate within a predetermined angle range by the rotation of the high-speed cam 12. Can be opened and closed by raising and lowering.
Since the lift amount (H) of the valve 14 by the high-speed cam 12 is larger than the lift amount (h) of the valve 14 by the low-speed cam 13 (see FIG. 8), the flow rate of air supplied to the cylinder of the engine increases. .

On the other hand, in the variable valve lift device for an engine according to the second embodiment of the present invention, when the engine is in a low speed and low load state, power is supplied to the drive module 50 as shown in FIG. Then, the driving pin 51 is moved upward, and the locking pin 40 connected to the driving pin 51 by the wire 60 is moved backward.
Therefore, the variable valve lift device of the engine separates the first body 20 and the second body 30 while maintaining the locking pin 40 housed in the mounting portion 36 of the second body 30. Operate in state.
At this time, the first and second rollers 38 and 39 installed on the second body 30 come into contact with the pair of low-speed cams 13 installed on the camshaft 10 and rotate.
Then, by the rotation of the low-speed cam 13, the second body 30 rotates about the pivot support mechanism 16 to open and close the valve 14.

At this time, the lift amount (h) of the valve 14 by the low-speed cam 13 becomes smaller than the lift amount (H) of the valve 14 by the high-speed cam 12 (see FIG. 7), so that the flow rate of air supplied to the cylinder of the engine is reduced. Decrease.
As described above, the present invention uses the connecting member connected to the drive pin to cause the locking pin to protrude and retract to connect or separate the first body and the second body, thereby providing a high-speed cam or a low-speed cam. By the rotation, the lift amount of the valve can be controlled in two stages of a high speed mode and a low speed mode.
As described above, according to the present invention, only the configuration of the cam is changed, and the variable valve lift device having the same configuration can be used to implement the two-stage control operation of the valve and the pause control operation by the configuration of the cam. .
As described above, the invention made by the inventor has been specifically described with reference to the embodiment. However, the present invention is not limited to the embodiment, and can be variously modified without departing from the gist of the invention.
That is, in the present invention, instead of the pressing pieces on both sides of the second body, openings are formed, and contact surfaces are formed on both ends of the first rotating shaft, and the contact surface and the upper end of the valve are brought into contact with each other. Increasing the contact area can also be modified to improve the operating characteristics of the valve.

INDUSTRIAL APPLICABILITY The present invention is applied to the technology of a variable valve lift device of an engine that performs a valve stop control operation for deactivating some cylinders and a two-stage variable control operation in a high-speed mode and a low-speed mode according to the operating conditions of the engine. You.

10: Camshaft 11: Cam 12: High speed cam 13: Low speed cam 14: Valve 15: Restoring spring 16: Pivot support mechanism 20: First body 21: Rotating shaft 22: Rotating roller 23: Coupling hole 24: Roller shaft 25 : Mounting hole 26: supporting step 27: locking step 30: second body 31: front wall 311: insertion hole 32: inner wall 33: outer wall 34: pressing piece 35: support plate 36: mounting section 37: moving space 38, 39: first and second rollers 381, 382, 391, 392: roller bush 40: locking pin 41: locking spring 42: annular support portion 43: retaining ring 50: drive module 51: drive pin 52: Housing 53: Flange 54: Installation space 60: Wire 61: Coupling groove 62: Protection tube 63: Guide 64: Bracket 65, 66: First and second If members 70: Cylinder head

Claims (4)

A first body that rotates within a predetermined angle range by rotation of the high-speed cam coupled to the camshaft;
When connected to or separated from the first body and connected to the first body, the high-speed cam is rotated by the rotation of the high-speed cam. A second body that is rotated by the rotation of the provided low-speed cam to adjust the lift amount of the valve;
A locking pin operably coupled to the first body through the second body so as to be connected to or separated from the first body and the second body;
A drive module connected to the locking pin via a connecting member to cause the locking pin to move in and out;
A rotation shaft disposed at an upper portion of the valve and installed across both side walls of the first body and the second body so that the first body rotates.
Wherein is mounted on the rotary shaft, anda restoring spring providing a restoring force to return to its original position the first body that is rotated by the high-speed cam,
Based on the operating conditions of the engine, the valve lift is variably controlled in two stages, high-speed mode and low-speed mode,
Slow engine, by operating the locking pin in a low load condition, separating said first body and the second body performs a pause control operation of the valve to deactivate the cylinder,
The drive module is installed above a cylinder head of a vehicle,
The connection member that transmits the driving force of the drive pin to the lock pin is installed between the drive pin and the lock pin of the drive module ,
The drive module is installed in a housing formed in a cylindrical shape,
At the lower end of the housing, a square plate-like flange portion is formed so as to be installed on the upper surface of the cylinder head of the vehicle,
The variable valve lift device for an engine according to claim 1, wherein the connection member is installed in a protection tube made of a flexible and shape-freezing material . First and second coupling members are installed at a front end and a rear end of the protection tube, respectively, so as to be coupled to the second body and the housing,
The variable valve lift of an engine according to claim 1 , wherein threads are formed on an outer peripheral surface of the second coupling member and an inner peripheral surface of a coupling space formed in the housing, respectively. apparatus. A guide for guiding the protection tube is provided outside the protection tube,
The guide is provided with one or more brackets for fixing the protection tube inside the cylinder head,
A coupling space corresponding to the outer shape of the protection tube is formed at a central portion of the guide,
The variable valve lift device for an engine according to claim 1 , wherein the upper end and the lower end of the guide are bent at one side. The second body has a front wall, an inner wall, and an outer wall respectively installed on the front and both sides so as to be disposed on the front and both sides of the first body,
A support plate installed between the inner wall and the rear end of the outer wall and supported in contact with the upper end of a pivot support mechanism;
A center portion of the restoring spring is provided so as to be inserted into and supported by an insertion hole formed in a front wall of the second body,
Both ends of the restoring spring are supported by supporting steps formed on both side walls of the first body,
First and second rollers rotated by the low-speed cam are respectively installed between the inner side wall and the outer side wall of the second body so as to reduce friction at the time of contact with the low-speed cam,
The first body is provided with a rotating roller rotated by the high-speed cam so as to reduce friction at the time of contact with the high-speed cam,
The drive pin is engaged with a rear end of the first body so that the first and second bodies rotate integrally by rotation of the high-speed cam when the drive pin moves forward. A pawl is formed,
The second body is provided with an attachment portion through which the drive pin is slidably provided.
Wherein the mounting portion, the variable valve lift device of an engine according to any one of claims 1 to 3, characterized in that movement space in which the driving pin is moved is formed.

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